1 /* 2 * Copyright (c) 1982, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)subr_prof.c 7.9 (Berkeley) 06/30/90 8 */ 9 10 #ifdef GPROF 11 #include "gprof.h" 12 #include "param.h" 13 #include "systm.h" 14 #include "malloc.h" 15 16 /* 17 * Froms is actually a bunch of unsigned shorts indexing tos 18 */ 19 int profiling = 3; 20 u_short *froms; 21 struct tostruct *tos = 0; 22 long tolimit = 0; 23 char *s_lowpc = (char *)KERNBASE; 24 extern char etext; 25 char *s_highpc = &etext; 26 u_long s_textsize = 0; 27 int ssiz; 28 u_short *sbuf; 29 u_short *kcount; 30 31 kmstartup() 32 { 33 u_long fromssize, tossize; 34 35 /* 36 * Round lowpc and highpc to multiples of the density we're using 37 * so the rest of the scaling (here and in gprof) stays in ints. 38 */ 39 s_lowpc = (char *) 40 ROUNDDOWN((unsigned)s_lowpc, HISTFRACTION*sizeof (HISTCOUNTER)); 41 s_highpc = (char *) 42 ROUNDUP((unsigned)s_highpc, HISTFRACTION*sizeof (HISTCOUNTER)); 43 s_textsize = s_highpc - s_lowpc; 44 printf("Profiling kernel, s_textsize=%d [%x..%x]\n", 45 s_textsize, s_lowpc, s_highpc); 46 ssiz = (s_textsize / HISTFRACTION) + sizeof (struct phdr); 47 sbuf = (u_short *)malloc(ssiz, M_GPROF, M_WAITOK); 48 if (sbuf == 0) { 49 printf("No space for monitor buffer(s)\n"); 50 return; 51 } 52 bzero(sbuf, ssiz); 53 fromssize = s_textsize / HASHFRACTION; 54 froms = (u_short *)malloc(fromssize, M_GPROF, M_WAITOK); 55 if (froms == 0) { 56 printf("No space for monitor buffer(s)\n"); 57 free(sbuf, M_GPROF); 58 sbuf = 0; 59 return; 60 } 61 bzero(froms, fromssize); 62 tolimit = s_textsize * ARCDENSITY / 100; 63 if (tolimit < MINARCS) 64 tolimit = MINARCS; 65 else if (tolimit > (0xffff - 1)) 66 tolimit = 0xffff - 1; 67 tossize = tolimit * sizeof (struct tostruct); 68 tos = (struct tostruct *)malloc(tossize, M_GPROF, M_WAITOK); 69 if (tos == 0) { 70 printf("No space for monitor buffer(s)\n"); 71 free(sbuf, M_GPROF), sbuf = 0; 72 free(froms, M_GPROF), froms = 0; 73 return; 74 } 75 bzero(tos, tossize); 76 tos[0].link = 0; 77 ((struct phdr *)sbuf)->lpc = s_lowpc; 78 ((struct phdr *)sbuf)->hpc = s_highpc; 79 ((struct phdr *)sbuf)->ncnt = ssiz; 80 kcount = (u_short *)(((int)sbuf) + sizeof (struct phdr)); 81 } 82 83 /* 84 * Special, non-profiled versions 85 */ 86 #if defined(hp300) && !defined(__GNUC__) 87 #define splhigh _splhigh 88 #define splx _splx 89 #endif 90 91 /* 92 * This routine is massaged so that it may be jsb'ed to on vax. 93 */ 94 asm(".text"); 95 asm("#the beginning of mcount()"); 96 asm(".data"); 97 mcount() 98 { 99 register char *selfpc; /* r11 => r5 */ 100 register u_short *frompcindex; /* r10 => r4 */ 101 register struct tostruct *top; /* r9 => r3 */ 102 register struct tostruct *prevtop; /* r8 => r2 */ 103 register long toindex; /* r7 => r1 */ 104 static int s; 105 106 asm(" .text"); /* make sure we're in text space */ 107 /* 108 * Check that we are profiling. 109 */ 110 if (profiling) 111 goto out; 112 /* 113 * Find the return address for mcount, 114 * and the return address for mcount's caller. 115 */ 116 #ifdef lint 117 selfpc = (char *)0; 118 frompcindex = 0; 119 #else 120 ; /* avoid label botch */ 121 #ifdef __GNUC__ 122 #if defined(vax) 123 Fix Me!! 124 #endif 125 #if defined(tahoe) 126 Fix Me!! 127 #endif 128 #if defined(hp300) 129 /* 130 * selfpc = pc pushed by mcount jsr, 131 * frompcindex = pc pushed by jsr into self. 132 * In GCC the caller's stack frame has already been built so we 133 * have to chase a6 to find caller's raddr. This assumes that all 134 * routines we are profiling were built with GCC and that all 135 * profiled routines use link/unlk. 136 */ 137 asm("movl a6@(4),%0" : "=r" (selfpc)); 138 asm("movl a6@(0)@(4),%0" : "=r" (frompcindex)); 139 #endif 140 #else 141 #if defined(vax) 142 asm(" movl (sp), r11"); /* selfpc = ... (jsb frame) */ 143 asm(" movl 16(fp), r10"); /* frompcindex = (calls frame) */ 144 #endif 145 #if defined(tahoe) 146 asm(" movl -8(fp),r12"); /* selfpc = callf frame */ 147 asm(" movl (fp),r11"); 148 asm(" movl -8(r11),r11"); /* frompcindex = 1 callf frame back */ 149 #endif 150 #if defined(hp300) 151 asm(" .text"); /* make sure we're in text space */ 152 asm(" movl a6@(4),a5"); /* selfpc = pc pushed by mcount jsr */ 153 asm(" movl a6@(8),a4"); /* frompcindex = pc pushed by jsr into 154 self, stack frame not yet built */ 155 #endif 156 #endif /* not __GNUC__ */ 157 #endif /* not lint */ 158 /* 159 * Insure that we cannot be recursively invoked. 160 * this requires that splhigh() and splx() below 161 * do NOT call mcount! 162 */ 163 #if defined(hp300) && defined(__GNUC__) 164 asm("movw sr,%0" : "=g" (s)); 165 asm("movw #0x2700,sr"); 166 #else 167 s = splhigh(); 168 #endif 169 /* 170 * Check that frompcindex is a reasonable pc value. 171 * For example: signal catchers get called from the stack, 172 * not from text space. too bad. 173 */ 174 frompcindex = (u_short *)((long)frompcindex - (long)s_lowpc); 175 if ((u_long)frompcindex > s_textsize) 176 goto done; 177 frompcindex = 178 &froms[((long)frompcindex) / (HASHFRACTION * sizeof (*froms))]; 179 toindex = *frompcindex; 180 if (toindex == 0) { 181 /* 182 * First time traversing this arc 183 */ 184 toindex = ++tos[0].link; 185 if (toindex >= tolimit) 186 goto overflow; 187 *frompcindex = toindex; 188 top = &tos[toindex]; 189 top->selfpc = selfpc; 190 top->count = 1; 191 top->link = 0; 192 goto done; 193 } 194 top = &tos[toindex]; 195 if (top->selfpc == selfpc) { 196 /* 197 * Arc at front of chain; usual case. 198 */ 199 top->count++; 200 goto done; 201 } 202 /* 203 * Have to go looking down chain for it. 204 * Top points to what we are looking at, 205 * prevtop points to previous top. 206 * We know it is not at the head of the chain. 207 */ 208 for (; /* goto done */; ) { 209 if (top->link == 0) { 210 /* 211 * Top is end of the chain and none of the chain 212 * had top->selfpc == selfpc. 213 * So we allocate a new tostruct 214 * and link it to the head of the chain. 215 */ 216 toindex = ++tos[0].link; 217 if (toindex >= tolimit) 218 goto overflow; 219 top = &tos[toindex]; 220 top->selfpc = selfpc; 221 top->count = 1; 222 top->link = *frompcindex; 223 *frompcindex = toindex; 224 goto done; 225 } 226 /* 227 * Otherwise, check the next arc on the chain. 228 */ 229 prevtop = top; 230 top = &tos[top->link]; 231 if (top->selfpc == selfpc) { 232 /* 233 * There it is, increment its count and 234 * move it to the head of the chain. 235 */ 236 top->count++; 237 toindex = prevtop->link; 238 prevtop->link = top->link; 239 top->link = *frompcindex; 240 *frompcindex = toindex; 241 goto done; 242 } 243 244 } 245 done: 246 #if defined(hp300) && defined(__GNUC__) 247 asm("movw %0,sr" : : "g" (s)); 248 #else 249 splx(s); 250 #endif 251 /* and fall through */ 252 out: 253 #if defined(vax) 254 asm(" rsb"); 255 #endif 256 return; 257 overflow: 258 profiling = 3; 259 printf("mcount: tos overflow\n"); 260 goto out; 261 } 262 asm(".text"); 263 asm("#the end of mcount()"); 264 asm(".data"); 265 #endif 266